Massage unit



FIG. 1 is a front perspective view of a massage unit, showing my new design;

FIG. 2 is a side view thereof, the opposite side view being identical;

FIG. 3 is an end view thereof, the opposite end view being identical;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a massage unit, as shown. 